NK, NKG - Grundfos

NK, NKGInstallation and operating instructions

NK NKGInstallation and operating instructions(all available languages)http://net.grundfos.com/qr/i/96646512

GRUNDFOS INSTRUCTIONS

NK, NKG

English (GB)Installation and operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Български (BG)Упътване за монтаж и експлоатация. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Čeština (CZ)Montážní a provozní návod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Deutsch (DE)Montage- und Betriebsanleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Dansk (DK)Monterings- og driftsinstruktion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

Eesti (EE)Paigaldus- ja kasutusjuhend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Español (ES)Instrucciones de instalación y funcionamiento. . . . . . . . . . . . . . . . . . . . . . . . . . . 306

Suomi (FI)Asennus- ja käyttöohjeet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

Français (FR)Notice d'installation et de fonctionnement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407

Ελληνικά (GR)Οδηγίες εγκατάστασης και λειτουργίας . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457

Hrvatski (HR)Montažne i pogonske upute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510

Magyar (HU)Telepítési és üzemeltetési utasítás . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558

Italiano (IT)Istruzioni di installazione e funzionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 608

Lietuviškai (LT)Įrengimo ir naudojimo instrukcija . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 657

Latviešu (LV)Uzstādīšanas un ekspluatācijas instrukcija . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 706

Nederlands (NL)Installatie- en bedieningsinstructies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 755

Polski (PL)Instrukcja montażu i eksploatacji . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807

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Português (PT)Instruções de instalação e funcionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 858

Română (RO)Instrucţiuni de instalare şi utilizare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 909

Srpski (RS)Uputstvo za instalaciju i rad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 959

Svenska (SE)Monterings- och driftsinstruktion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1007

Slovensko (SI)Navodila za montažo in obratovanje . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1056

Slovenčina (SK)Návod na montáž a prevádzku . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1104

Türkçe (TR)Montaj ve kullanım kılavuzu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1153

Українська (UA)Інструкції з монтажу та експлуатації . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1204

中文 (CN)安装和使用说明书 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1260

日本語 (JP)

取扱説明書. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1306

(AR) العربيةالتشغيل و التركيب تعليمات . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1353

4 NK, NKG

Table of contents

English (GB) Installation and operating instructions

Original installation and operating instructions

Table of contents1. General information . . . . . . . . . . . . . 51.1 Hazard statements . . . . . . . . . . . . . . 51.2 Notes . . . . . . . . . . . . . . . . . . . . . 6

2. Product introduction . . . . . . . . . . . . 62.1 Product description . . . . . . . . . . . . . . 62.2 Identification. . . . . . . . . . . . . . . . . . 7

3. Receiving the product. . . . . . . . . . . . 163.1 Delivery . . . . . . . . . . . . . . . . . . . . 163.2 Transporting the product . . . . . . . . . . . 163.3 Inspecting the product . . . . . . . . . . . . 163.4 Storage after delivery . . . . . . . . . . . . . 16

4. Installing the product . . . . . . . . . . . . 174.1 Location . . . . . . . . . . . . . . . . . . . . 17

5. Mechanical installation . . . . . . . . . . . 175.1 Lifting the product . . . . . . . . . . . . . . . 175.2 Foundation of horizontally mounted NK,

NKG pumps . . . . . . . . . . . . . . . . . . 185.3 Alignment of pump and motor . . . . . . . . 225.4 Pipes . . . . . . . . . . . . . . . . . . . . . 285.5 Vibration damping. . . . . . . . . . . . . . . 285.6 Expansion joints. . . . . . . . . . . . . . . . 295.7 Stuffing box piping . . . . . . . . . . . . . . 305.8 Bearing bracket . . . . . . . . . . . . . . . . 305.9 Bearing monitoring . . . . . . . . . . . . . . 325.10 Pressure gauge and mano-vacuum

gauge . . . . . . . . . . . . . . . . . . . . . 335.11 Ammeter . . . . . . . . . . . . . . . . . . . 335.12 Condensation cover. . . . . . . . . . . . . . 33

6. Electrical connection . . . . . . . . . . . . 336.1 Motor protection. . . . . . . . . . . . . . . . 346.2 Cable entry and screwed connection, MG

motor . . . . . . . . . . . . . . . . . . . . . 346.3 Synchronous motors . . . . . . . . . . . . . 346.4 Frequency converter operation . . . . . . . . 35

7. Starting up the product . . . . . . . . . . . 357.1 Checking pumps with stuffing box . . . . . . 357.2 Flushing the pipe system . . . . . . . . . . . 357.3 Priming . . . . . . . . . . . . . . . . . . . . 367.4 Checking the direction of rotation . . . . . . 377.5 Starting up the pump . . . . . . . . . . . . . 377.6 Shaft seal run-in period . . . . . . . . . . . . 377.7 Number of motors starting or stopping . . . . 387.8 Reference readings of monitoring

equipment . . . . . . . . . . . . . . . . . . . 38

8. Storing the product . . . . . . . . . . . . . 38

9. Servicing the product . . . . . . . . . . . . 399.1 Contaminated products . . . . . . . . . . . . 399.2 Service kits . . . . . . . . . . . . . . . . . . 39

10. Maintaining the product. . . . . . . . . . . 3910.1 Maintenance of the pump. . . . . . . . . . . 3910.2 Lubrication of bearings in bearing bracket . . 4010.3 Monitoring equipment. . . . . . . . . . . . . 4310.4 Maintaining the motor . . . . . . . . . . . . . 4310.5 Lubrication of motor bearings. . . . . . . . . 4310.6 Applying sealant to plugs . . . . . . . . . . . 43

11. Taking the product out of operation . . . . 4411.1 Protecting the pump during periods of

inactivity and frost. . . . . . . . . . . . . . . 44

12. Fault finding the product . . . . . . . . . . 45

13. Technical data . . . . . . . . . . . . . . . . 4813.1 Operating conditions . . . . . . . . . . . . . 4813.2 Electrical data . . . . . . . . . . . . . . . . . 5013.3 Sound pressure level . . . . . . . . . . . . . 5113.4 Belt drive . . . . . . . . . . . . . . . . . . . 5213.5 Operation with combustion engine . . . . . . 52

14. Disposing of the product . . . . . . . . . . 52

1. General informationRead this document before you install theproduct. Installation and operation mustcomply with local regulations and acceptedcodes of good practice.

1.1 Hazard statementsThe symbols and hazard statements below mayappear in Grundfos installation and operatinginstructions, safety instructions and serviceinstructions.

DANGERIndicates a hazardous situation which, ifnot avoided, will result in death or seriouspersonal injury.

WARNINGIndicates a hazardous situation which, ifnot avoided, could result in death orserious personal injury.

CAUTIONIndicates a hazardous situation which, ifnot avoided, could result in minor ormoderate personal injury.

The hazard statements are structured in the followingway:

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(GB)

SIGNAL WORDDescription of the hazardConsequence of ignoring the warning• Action to avoid the hazard.

1.2 NotesThe symbols and notes below may appear inGrundfos installation and operating instructions,safety instructions and service instructions.

Observe these instructions for explosion-proof products.

A blue or grey circle with a white graphicalsymbol indicates that an action must betaken.

A red or grey circle with a diagonal bar,possibly with a black graphical symbol,indicates that an action must not be takenor must be stopped.

If these instructions are not observed, itmay result in malfunction or damage to theequipment.

Tips and advice that make the work easier.

2. Product introduction

2.1 Product descriptionNK, NKG are non-self-priming, single stage,centrifugal volute pumps with axial inlet port andradial outlet port.NK pumps comply with EN 733.NKG pumps comply with ISO 2858.

2.1.1 Pumped liquidsNK, NKG pumps are suitable for clean, thin, non-explosive liquids without solid particles or fibres. Thepumped liquid must not attack the pump materialschemically.

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English (GB)

2.2 Identification2.2.1 Nameplate

Example of NK, NKG nameplate

4

6H m

n min -1

%

MEI

ηp

(in.)

HzType/Model f DK-8850 Bjerringbro, Denmark

9987

276

1

Ver.Q

p/tImp. Dia.

0.70 50NKGE 200-150-200/218-202AA1F2BESBQQEWW1

B96838797P420430001

16/1208.58

Made in Hungary

30.983.3

2970

m3/hbar/°CMAX

761.5

1

11

532

9

7 8

12 10

WRAS 23C

TM05

6007

Legend

Pos. Description

1 Type designation

2 Identification code

B Service model

96838797 Product number

P4 Production site code

2015 Production year and week(YYWW)

0001 Serial number

3 Nominal flow rate

4 Nominal pump head

5 Pressure rating and maximum temperature

6 Hydraulic efficiency at best efficiency point

7 Minimum efficiency index

8 Frequency

9 Actual impeller diameter

10

Drinking water approvalor Pump Energy Index (PEI)PEICL: constant loadPEIVL: variable load

11 Country of origin

12 Rated pump speed

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2.2.2 Type key

Example 1: NKGE 125-100-160/160-140BSA1F2AESBAQERW1Example 2: NKGE 200-150-315.2/317ACA1F3AESDAQFYW4Example 3: NKG 100-65-200/219SAZ1F2KESBQQEXX4Example 4: NK 32-125/97AA1F1AESBQQEHX2Example 5: NK 80-200/222VAXEF1BESBQQEWX2

Pos. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Example 1 NKGE 125 -100 -160 /160-140 B S A1 F 2 A E S BAQE R W 1

Example 2 NKGE 200 -150 -315.2 /317 A C A1 F 3 A E S DAQF Y W 4

Example 3 NKG 100 -65 -200 /219 S A Z1 F 2 K E S BQQE X X 4

Example 4 NK 32 -125 /97 A A1 F 1 A E S BQQE H X 2

Example 5 NK 80 -200 /222 V A XE F 1 B E S BQQE W X 2

Pos. Explanation

1 Type range

2 Nominal diameter of inlet port (DN)

3 Nominal diameter of outlet port (DN)

4 Nominal impeller diameter [mm]

5 Actual impeller diameter [mm]

6

Impeller type'blank': Closed impeller, cylindrical trim. If one dimension is shown, the impeller has a cylindrical trim,for example 317'blank': Closed impeller, conical trim. If two dimensions are shown, the impeller has a conical trim, forexample 160-140S: Semi-open impellerV: Super vortex impeller

7

Hydraulic versionA: 1st versionB: 2nd versionC: 3rd versionD: 4th version

8

Sensor version'blank': Pump without sensorC: Without built-in sensor, one cable and one pressure sensor are supplied with the pump.S: Pump with built-in differential-pressure sensor, Series 2000

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English (GB)

Pos. Explanation

9

Code for pump version; the codes may be combinedA1: Basic version, grease-lubricated standard bearing design, standard couplingA2: Basic version, grease-lubricated standard bearing design, spacer couplingB: Oversize motor(+E): With ATEX approval, certificate or test report, the second character of the pump version code isan EG1: Grease-lubricated heavy-duty bearing design, standard couplingG2: Grease-lubricated heavy-duty bearing design, spacer couplingH1: Oil-lubricated heavy-duty bearing design, standard couplingH2: Oil-lubricated heavy-duty bearing design, spacer couplingI1: Pump without motor, grease-lubricated standard bearing design, standard couplingI2: Pump without motor, grease-lubricated standard bearing design, spacer couplingJ1: Pump without motor, grease-lubricated heavy-duty bearing design, standard couplingJ2: Pump without motor, grease-lubricated heavy-duty bearing design, spacer couplingK1: Pump without motor, oil-lubricated heavy-duty bearing design, standard couplingK2: Pump without motor, oil-lubricated heavy-duty bearing design, spacer couplingY1: Bare shaft pump, grease-lubricated standard bearing designW1: Bare shaft pump, grease-lubricated heavy-duty bearing designZ1: Bare shaft pump, oil-lubricated heavy-duty bearing designX: Special version; used in case of further customisation than already listed

10

Pipe connectionE: Table E flangeF: DIN flangeG: ANSI flangeJ: JIS flange

11

Flange pressure rating (PN - rated pressure)1: 10 bar2: 16 bar3: 25 bar4: 40 bar5: Other pressure rating

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(GB)

Pos. Explanation

12

Code for materials

Code Pump housing Impeller Wear ring Shaft

A EN-GJL-250 EN-GJL-200 Bronze/brass 1.4021/1.4034

B EN-GJL-250 Bronze CuSn10 Bronze/brass 1.4021/1.4034

C EN-GJL-250 EN-GJL-200 Bronze/brass 1.4401

D EN-GJL-250 Bronze CuSn10 Bronze/brass 1.4401

E EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4021/1.4034

F EN-GJL-250 Bronze CuSn10 EN-GJL-250 1.4021/1.4034

G EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4401

H EN-GJL-250 Bronze CuSn10 EN-GJL-250 1.4401

I 1.4408 1.4408 1.4517 1.4462

J 1.4408 1.4408 Carbon-graphite-filledPTFE (Graflon®) 1.4462

K 1.4408 1.4408 1.4517 1.4401

L 1.4517 1.4517 1.4517 1.4462

M 1.4408 1.4517 1.4517 1.4401

N 1.4408 1.4408 Carbon-graphite-filledPTFE (Graflon®) 1.4401

P 1.4408 1.4517 Carbon-graphite-filledPTFE (Graflon®) 1.4401

R 1.4517 1.4517 Carbon-graphite-filledPTFE (Graflon®) 1.4462

S EN-GJL-250 1.4408 Bronze/brass 1.4401

T EN-GJL-250 1.4517 Bronze/brass 1.4462

U 1.4408 1.4517 1.4517 1.4462

W 1.4408 1.4517 Carbon-graphite-filledPTFE (Graflon®) 1.4462

Z 1.4469 1.4469 1.4410 1.4410

X Special version

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English (GB)

Pos. Explanation

13

Rubber parts in pumpE: EEF: FFG: FEH: KEI: KMJ: KVK: KKM: MNN: MEO: OOV: VV• The first letter indicates material of elastomer between pump housing and cover, and elastomer

between cover and split cover.• The second letter indicates material of elastomer between split cover and seal housing.See the material description in the table below.

Code Material description

E EPDM

F FXM (Fluoraz®)

K FFKM (Kalrez®)

M FEPS (PTFE-sheathed silicone O-ring)

O HNBR

V FKM (Viton®)

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Shaft seal arrangementB: Stuffing boxC: Cartridge seal, singleD: Cartridge seal, doubleO: Back-to-back, double sealP: Tandem, double sealS: Single seal

15

Shaft seal(s) in pumpLetter or digit code for mechanical shaft seal and shaft seal rubber parts• 4 letters: Single mechanical shaft seal, such as BQQE, or single cartridge seal, such as HBQV• 4 digits:

- double seal solution; example 2716, where 27 is DQQV, primary seal, and 16 is BQQV,secondary seal;

- double cartridge seal; example 5150, where 51 is HQQU, primary seal, and 50 is HBQV,secondary seal

The relation between letters and digits of the shaft seals is described in Codes for shaft seals.

16 Code for rated motor power [kW]. See Codes for rated motor power.

17 Code for phase and voltage [V] or other information. See Codes for phase and voltage or otherinformation.

18 Code for speed variant [rpm]. See Codes for speed variant.

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(GB)

Example 1: NKGE125-100-160/160-140BSA1F2AESBAQERW1 showsan NKGE 125-100-160 pump with thesecharacteristics:• 160-140 mm closed impeller, conical trim• hydraulic version B• with built-in differential-pressure sensor• grease-lubricated standard bearing design• standard coupling• DIN flange to EN 1092-2 pipe connection• 16 bar flange pressure rating• cast iron pump housing, EN-GJL-250• cast iron impeller, EN-GJL-200• bronze/brass wear ring• stainless steel shaft, EN 1.4021/1.4034• EPDM O-rings for pump cover and seal cover• EPDM O-ring for pump cover• single shaft seal arrangement• BAQE shaft seal• 30 kW motor, not for sale in North America, 2-

pole, 50 Hz.

Example2: NKGE 200-150-315.2/317ACA1F3AESDAQFYW4shows an NKG 200-150-315.2 pump with thesecharacteristics:• 317 mm closed impeller, cylindrical trim• hydraulic version A• without built-in sensor, one cable and one

pressure sensor are supplied with the pump.• grease-lubricated standard bearing design• standard coupling• DIN flange to EN 1092-2 pipe connection• 25 bar flange pressure rating• cast iron pump housing, EN-GJL-250• cast iron impeller, EN-GJL-200• bronze/brass wear ring• stainless steel shaft, EN 1.4021/1.4034• EPDM O-rings for pump cover and seal cover• EPDM O-ring for seal housing• single shaft seal arrangement• DAQF shaft seal• motor size outside DOE scope, not for sale in

North America, 4-pole, 60 Hz..

Example 3: NKG100-65-200/219SAZ1F2KESBQQEXX4 shows anNKG 100-65-200 pump with these characteristics:• 219 mm semi-open impeller• hydraulic version A• bare shaft pump, oil-lubricated heavy-duty

bearing design• DIN flange to EN 1092-2 pipe connection• 16 bar flange pressure rating• stainless steel pump housing, EN 1.4408• stainless steel impeller, EN 1.4408• stainless steel wear ring, EN 1.4517• stainless steel shaft, EN 1.4401• EPDM O-rings for pump cover and seal cover• EPDM O-ring for seal housing• single shaft seal arrangement• BQQE shaft seal• bare shaft pump without motor, for 4-pole

operation, 60 Hz,.

Example 4: NK 32-125/97AA1F1AESBQQEHX2shows an NK 32-125 pump with these characteristics:• 97 mm closed impeller, cylindrical trim• hydraulic version A• grease-lubricated standard bearing design• standard coupling• DIN flange to EN 1092-2 pipe connection• 10 bar flange pressure rating• cast iron pump housing, EN-GJL-250• cast iron impeller, EN-GJL-200• bronze/brass wear ring• stainless steel shaft, EN 1.4021/1.4034• EPDM O-rings for pump cover and seal cover• EPDM O-ring for seal housing• single shaft seal arrangement• BQQE shaft seal• 1.5 kW motor, US DOE regulated motor, 2-pole,

60 Hz.

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English (GB)

Example 5: NK 80-200/222VAXEF1BESBQQEWX2shows an NK 80-200 pump with these characteristics:• 222 mm super vortex impeller• hydraulic version A• PWIS-free certificate included• DIN flange to EN 1092-2 pipe connection• 10 bar flange pressure rating• cast iron pump housing, EN-GJL-250• bronze CuSn10 impeller• bronze/brass wear ring• stainless steel shaft, EN 1.4021/1.4034• EPDM O-rings for pump cover and seal cover• EPDM O-ring for seal housing• single shaft seal arrangement• BQQE shaft seal• 90 kW motor, US DOE regulated motor, 2-pole,

60 Hz..

Codes for shaft sealsThe digits are only used for double shaft sealsolutions.

Digits Letters Description

10 BAQE Single mechanical shaft seal

11 BAQV Single mechanical shaft seal

12 BBQE Single mechanical shaft seal

13 BBQV Single mechanical shaft seal

15 BQQE Single mechanical shaft seal

16 BQQV Single mechanical shaft seal

19 AQAE Single mechanical shaft seal

20 AQAV Single mechanical shaft seal

21 AQQE Single mechanical shaft seal

22 AQQV Single mechanical shaft seal

23 AQQX Single mechanical shaft seal

24 AQQK Single mechanical shaft seal

25 DAQF Single mechanical shaft seal

26 DQQE Single mechanical shaft seal

27 DQQV Single mechanical shaft seal

28 DQQX Single mechanical shaft seal

29 DQQK Single mechanical shaft seal

50 HBQV Cartridge seal

51 HQQU Cartridge seal

52 HAQK Cartridge seal

SNEA Stuffing box

SNEB Stuffing box

SNEC Stuffing box

SNED Stuffing box

SNOA Stuffing box

SNOB Stuffing box

SNOC Stuffing box

SNOD Stuffing box

SNFA Stuffing box

SNFB Stuffing box

SNFC Stuffing box

SNFD Stuffing box

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(GB)

Letter codes for shaft seals

Codeexample

Description Code explanation

B Shaft seal type

A: O-ring seal with fixeddriverB: Rubber bellows sealD: O-ring seal, balancedH: Cartridge seal,balanced

QMaterial ofrotating sealface

A: Carbon, metal-impregnated withantimony which is notapproved for potablewaterB: Carbon, resin-impregnatedQ: Silicon carbide

Q Material ofstationary seal

A: Carbon, metal-impregnated withantimony which is notapproved for potablewaterQ: Silicon carbide

E

Material ofsecondary sealand otherrubber andcomposite parts,except the wearring

E: EPDMV: FKM (Viton®)F: FXM (Fluoraz®)K: FFKM (Kalrez®)X: HNBRU: Dynamic O-rings inFFKM and static O-ringsin PTFE

For a thorough description of shaft seal types andmaterials, see the data booklet "NB, NBG, NK, NKG,NBE, NBGE, NKE, NKGE - Custom-built pumpsaccording to EN 733 and ISO 2858".

Letter codes for stuffing boxesExample: SNEA

Code Description Explanation

S Stuffing boxtype

S: Packing type stuffingbox

N Cooling method N: Uncooled stuffing box

E Barrier liquid

E: With internal barrierliquidF: With external barrierliquidO: Without barrier liquid

A Material

A: PTFE-impregnatedfibre packing rings(Buraflon®) and EPDMO-rings in the pumphousingB: Graphite-PTFEcompound packing rings(Thermoflon®) andEPDM O-ring in thepump housingC: PTFE-impregnatedfibre packing rings(Buraflon®) and FKM O-ring in the pump housingD: Graphite-PTFEcompound packing rings(Thermoflon®) and FKMO-ring in the pumphousing

For a thorough description of stuffing boxes andmaterials, see the data booklet "NB, NBG, NK, NKG,NBE, NBGE, NKE, NKGE - Custom-built pumpsaccording to EN 733 and ISO 2858".

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English (GB)

Codes for rated motor powerPos. 16 in NK, NKG type key example.

CodeDescription

[hp] [kW]

A 0.16 0.12

B 0.25 0.18

C 0.33 0.25

D 0.5 0.37

E 0.75 0.55

F 1 0.75

G 1.5 1.1

H 2 1.5

I 3 2.2

J 4 3

K 5 (5.51) 3.7 (41)

L 7.5 5.5

M 10 7.5

N 15 11

O 20 15

P 25 18.5

Q 30 22

R 40 30

S 50 37

T 60 45

U 75 55

V 100 75

W 125 90

X Bare shaftpump

Y > 2002 > 1502

1 150 110

2 175 132

3 200 150

4 2153 1603

5 2503 1853

1 Value in bracket is for the standard IEC motor size.Value outside bracket is for the motor size accordingto NEMA standards.

2 Used for pumps where the pump shaft input powerexceeds 200 hp (150 kW) and is not regulated underthe DOE pump rule.3 Special cases with power sizes above 200 hp (150kW) which are still regulated under the DOE pumprule. For example: Pump has a P2 value of 198 hp(147.6 kW) in its duty point (in DOE scope) butcustomer wants the 215 hp (160 kW) motor instead ofthe 200 hp (150 kW). The pump is in scope of theDOE regulation and requires a PEI value and a motorcode.

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Codes for phase and voltage or other informationPos. 17 in NK, NKG type key example.

Code Description

A E-motor (ECM1), 1 x 200-240 V

B E-motor (ECM1), 3 x 200-240 V

C E-motor (ECM1), 3 x 440-480 V

D E-motor (ECM1), 3 x 380-500 V

V Intended for use with external VFDonly, asynchronous motor

W Not for sale in North America

X No motor or US DOE regulated motor(CC marked motor)

Y Out of DOE scope

Z E-motor, asynchronous motor

1ECM: Electronically Commutated Motor.

Codes for speed variantPos. 18 in NK, NKG type key example.

Code Description

A 1450-2200 RPM, E-motor (ECM1)

B 2900-4000 RPM, E-motor (ECM1)

C 4000-5900 RPM, E-motor (ECM1)

1 2-pole, 50 Hz (Asynchronous motor)








1ECM: Electronically Commutated Motor.

3. Receiving the product

3.1 DeliveryThe pumps are tested 100 % before leaving thefactory. The test includes a function test where thepump performance is measured to ensure that thepump meets the requirements of relevant standards.Test certificates are available from Grundfos. After theinstallation, the alignment of pump and motor must bechecked again. See section Alignment of pump andmotor.

3.2 Transporting the product

WARNINGOverhead loadDeath or serious personal injury‐ Pay attention to the pump weight, and

take precautions to prevent personalinjury if the pump topples or falls byaccident.

• Always transport the pump in the specifiedposition.

• Securely fasten the pump to prevent damage tothe shaft and shaft seal caused by excessivevibrations and knocks.

• Do not lift the pump by the shaft.

3.3 Inspecting the product• Confirm that the product received is in accordance

with the order.• Confirm that the voltage, phase and frequency of

the product match the voltage, phase andfrequency of the installation site. SeeIdentification.

• Check the product for defects or damagesimmediately upon receipt. Any accessory orderedwill be packed in a separate container andshipped with the product.

• If any equipment is damaged in transit, report itimmediately to the carrier's agent. Make completenotations on the freight bill.

3.4 Storage after deliveryThe contractor must inspect the equipment ondelivery and make sure it is stored so as to avoidcorrosion or damage. See Storing the product.

16

English (GB)

4. Installing the product

4.1 Location

CAUTIONHot or cold surfaceMinor or moderate personal injury‐ When pumping hot or cold liquids,

make sure that persons cannotaccidentally come into contact with hotor cold surfaces.

The pump must be sited in a well-ventilated, but frost-free location.For inspection and repair, allow suitable clearancesfor pump or motor removal.• Pumps fitted with motors up to and including 4 kW

require a 0.3 m clearance behind the motor.

A

TM05

3727

Clearance behind the motor

Motor Minimum clearance, A

0.25 - 4 kW 0.3 m

• Pumps fitted with motors of 5.5 kW and up requirea 0.3 m clearance behind the motor and at least a1 m clearance above the motor to allow the use oflifting equipment.

B

A

TM07

7126

Clearance behind and above the motor

MotorMinimum clearance

A B

5.5 kW and up 0.3 m 1 m

5. Mechanical installation

5.1 Lifting the product

Motors from 4 kW and up are supplied withlifting eyes which must not be used forlifting the entire pump unit.

• Lift the pumps by means of nylon straps andshackles.

TM03

3948

Correct lifting of pump

TM03

3769

Incorrect lifting of pump

17

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(GB)

5.2 Foundation of horizontally mounted NK,NKG pumps

We recommend that you install the pump on a planeand rigid concrete foundation which is heavy enoughto provide permanent support for the entire pump.The foundation must be capable of absorbing anyvibration, normal strain or shock. As a rule of thumb,the weight of the concrete foundation should at leastbe 1.5 times the weight of the pump.The foundation must be 100 mm larger than the baseframe on all four sides.

Lf

h fX

X

B f

X

X

Lf

TM03

3771

Foundation, X equal to minimum 100 mm

The minimum height of the foundation, hf, can thenbe calculated:

hf =mpump × 1.5

Lf × Bf × δconcrete

hf Height of the foundation [m]

Lf Length of the foundation [m]

Bf Width of the foundation [m]

mpump Mass of the pump [kg]

δconcrete Density of the concrete [kg/m3]

The density, δ, of concrete is usually takenas 2,200 kg/m3.

Place the pump on the foundation, and fasten it. Thebase frame must be supported under its entire area.

TM03

3950

Correct foundation

TM03

4324

Incorrect foundation

18

English (GB)

5.2.1 Grouting of horizontally mounted NK, NKGpumps

For NK, NKG pumps with 2-pole motors equal to orbigger than 55 kW, grouting of the base frame ismandatory in order to prevent vibration energy fromthe rotating motor and liquid flow to evolve.Grouting requirements apply to both EN/ISO and C-channel base frames.

P2 lower than orequal to 45 kW

P2 equal to or higherthan 55 kW

2-pole Grouting optional Grouting mandatory

4-pole Grouting optional

6-pole Grouting optional

TM03

4587

EN/ISO base frame with pouring holes

5.2.2 Preparing the foundationWe recommend the following procedures to ensure agood foundation:1. Pour the foundation without interruption to 19 to

32 mm of the final level.Use an approved, non-shrinking concrete. Contactyour concrete supplier for advice if any doubts.

2. Use vibrators to ensure that the concrete is evenlydistributed. The top surface must be well scoredand grooved before the concrete sets. Thisprovides a bonding surface for the grout.

3. Embed anchor bolts in the concrete.Allow enough bolt length to reach through grout,shims, the lower part of the support rail, nuts andwashers.

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10

8

7654

1

2

3

9

TM07

5514

Pos. Description

1 Bolt length above the support rail

2 Thickness of the support rail

3 19-32 mm allowance for grout

4 Washer

5 Lug

6 Pipe sleeve

7 Foundation with rough top

8 Wedges and shims left in place

9 Support rail

10 5-10 mm

4. Let the foundation cure for several days beforelevelling and grouting the support rail.

19

Engl

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(GB)

5.2.3 Levelling the base frameFollow the steps below to level the base frame:1. Lift or jack up the base frame to the final level

19-32 mm above the concrete foundation, andsupport the base frame by means of blocks andshims both at the anchor bolts and midwaybetween bolts.

A

TM04

0488

A: 19-32 mm

2. Level the base frame by adding or removingshims under the base frame.

TM04

0489

3. Tighten the anchor bolt nuts against the baseframe.

4. Make sure the piping can be aligned to the pumpflanges without putting strain on pipes or flanges.

5.2.4 Preliminary alignment

DANGERElectric shockDeath or serious personal injury‐ Before starting work on the pump,

make sure that the power supply hasbeen switched off and cannot beaccidentally switched on again.

The pump and motor are pre-aligned on the baseframe from the factory. Some deformation of the baseframe may occur during transport and it is thereforeessential to check the alignment at the installation sitebefore the final grouting.A flexible coupling will only compensate for minormisalignments and must not be used to compensatefor excessive misalignment of the pump and motorshafts. Inaccurate alignment results in vibration andexcessive wear on the bearings, shaft or wear rings.Carry out alignment of the motor by placing shims ofdifferent thickness under the motor. If possible,replace several thin shims with one thick shim.

Carry out alignment of the motor only, aspipe strain will occur if the pump is shifted.

5.2.5 Grouting

If you have questions or doubts about thegrouting, please contact an expert ongrouting.

Grouting compensates for an uneven foundation,distributes the weight of the unit, dampens vibrationsand prevents shifting. Follow the steps below to dothe grouting:1. Use an approved, non-shrinking grout.

2. Embed reinforcing steel bars into the foundationby means of 2K anchor adhesive glue.

20

English (GB)

3. The number of steel bars depends on the size ofthe base frame, but we recommend that youdistribute a minimum of 20 bars evenly over thewhole area of the base frame.

TM04

0491

Example of foundation with minimum 20 bars

4. The free end of the steel bar must be 2/3 theheight of the base frame to ensure a propergrouting.

2/3

x h

h

TM04

0490

5. Soak top of concrete foundation thoroughly, thenremove surface water.

6. Ensure proper shuttering at both ends of the baseframe.

A

TM03

4590

A: shuttering

7. If necessary, check the levelling of the base frameagain before grouting.

8. Pour non-shrinking grout through the openings ofthe base frame until the space underneath thebase frame has been filled completely.

9. Fill the formwork with grout up to the base frametop level.

10. Allow the grout to dry thoroughly before attachingpiping to the pump. 24 hours is sufficient time withapproved grouting procedure.

11. When the grout has thoroughly hardened, checkthe anchor bolt nuts, and tighten, if necessary.

21

Engl

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(GB)

12. Approximately two weeks after pouring the grout,or when the grout has thoroughly dried, apply anoil-based paint to the exposed edges of the groutto prevent the grout from getting into contact withair and moisture.

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3

2

A

5

4

6

1

TM03

2946

Pos. Description

1 Base frame

2 19-32 mm (0.75 - 1.25 in) grout

3 Formwork

4 Foundation with rough top

5 Levelling wedges and shims left inplace

6 Grout

A 5-10 mm (0.2 - 0.4 in.)

After installation is finished, tighten thescrews connecting the flange, feet and theanchor bolts according to the tighteningtorques. You must apply an anti-loosemethod, such as mounting lock washers.

5.3 Alignment of pump and motorWhen a complete unit is supplied assembled from thefactory, the coupling halves have been accuratelyaligned by means of foil inserted under the pump andmotor mounting surfaces as required.As the pump/motor alignment may be affected duringtransport and installation, it must always be checkedagain before starting the pump.It is important to check the final alignment when thepump has obtained its operating temperature undernormal operating conditions.It is very important that the pump/motor alignment iscarried out correctly. Follow the procedure below.The values for ∅ and S2 can be found in the followingtable. The value for S1 is 0.2 mm.

S1S2

90 o

90 o

90 o

90 o

TM01

8753

Alignment

22

English (GB)

5.3.1 Aligning the pump and motor with astraightedge ruler

1. Make a rough alignment of pump and motor, andtighten the screws in the base frame to the correcttorque.

TM03

8340

See the table Tightening torquesTighteningtorques for hexagon head screws..

2. Make a mark on the coupling, for instance with amarker pen.

TM03

8301

3. Hold a straightedge ruler against the coupling,and determine the inaccuracy, if any, with a feelergauge.

TM03

8300

4. Turn the coupling 90 °, and repeat themeasurement with straightedge and feeler gauge.

TM03

8302

• If the measured values are less than 0.2 mm,the alignment is complete. Go to step 8.

5. Adjust the position of the motor. Loosen thescrews that hold the motor in place.

TM03

8321

6. Insert shims with the required thickness.

TM03

8322

7. Tighten the screws to the correct torque. Go tostep 3, and check the alignment once more.

TM03

8324

23

Engl

ish

(GB)

8. Check the gap S2 both vertically and horizontally.

TM03

8325

• If the air-gap width is within the tolerances, thealignment is complete.

• If not, go to step 6.See the table Air-gap width S2Air-gap width forcouplings..

5.3.2 Aligning the pump and motor with laserequipment

1. Make a rough alignment of pump and motor, andtighten the screws in the base frame to the correcttorque.

TM03

8340

See the table Tightening torquesTighteningtorques for hexagon head screws..

2. Fasten one laser bracket to the pump coupling.

TM03

8303

3. Fasten the other laser bracket to the motorcoupling.

TM03

8304

4. Place laser unit S, stationary, on the stationarypart and laser unit M, movable, on the movablepart.

TM03

8305

5. Interconnect the laser units, and connect onelaser unit to the control box.

TM03

8306

6. Make sure that the laser units are at the sameheight.

TM03

8307

24

English (GB)

7. Measure the distance between the white lines onthe laser units.

TM03

8309

8. Enter the distance.

TM03

8308

9. Measure the distance between the S unit and thecentre of the gap between the couplings.

TM03

8310


TM03

8311

11. Measure the distance from the S unit to the firstscrew on the motor.

TM03

8312


TM03

8313

13. Measure the distance from the S unit to the rearscrew on the motor.

TM03

8314

14. The control box shows that the laser units must beturned to position 9 o'clock.

TM03

8315

25

Engl

ish

(GB)

15. Turn the laser units to position 9 o'clock.

TM03

8316

16. Confirm on the control box.

TM03

8319

17. Turn the laser units to position 12 o'clock. Confirmon the control box.

TM03

8317

18. Turn the laser units to position 3 o'clock. Confirmon the control box.

TM03

8318

19. If the measured values are less than 0.1 mm, thealignment is complete. Go to step 24.

TM03

8320

20. Adjust the position of the motor. Loosen thescrews that hold the motor in place.

TM03

8321

21. Insert shims with the required thickness.

TM03

8322

22. Tighten the screws to the correct torque again.TM

0383

24

26

English (GB)

23. Repeat the alignment until the values are withinthe tolerances. Go to step 14.

TM03

8320

24. Check the gap S2.

TM03

8325

See the table Air-gap width S2Air-gap width forcouplings..

5.3.3 Tightening torques

Description DimensionsTightening

torque[Nm]

Hexagon headscrew

M6 10 ± 2

M8 12 ± 2.4

M10 23 ± 4.6

M12 40 ± 8

M16 80 ± 16

M20 120 ± 24

M24 120 ± 24

5.3.4 Air-gap width S2

Measure S2 all the way around thecoupling. The maximum permissibledeviation between the largest and thesmallest measurement is 0.2 mm.

After the installation is finished, tighten thescrews connecting the flange, feet and theanchor bolts according to the tighteningtorques. Anti-loose method should beapplied.

Outsidecouplingdiameter[mm]

Air-gap width S2 [mm]

Standard coupling Spacer coupling

Nominal Tolerance Nominal Tolerance

80

- -

4

0/-1

95 4

110 4

125

4 0/-1

4

140 4

160 4

200 6

225 6

250 8

If the coupling and motor are not supplied byGrundfos, make sure to follow the couplingmanufacturer’s instructions.

WARNINGCrushing hazardDeath or serious personal injury‐ To protect persons from rotating

machine parts, always install all guardsafter the installation is complete andbefore starting the pump.

27

Engl

ish

(GB)

5.4 Pipes5.4.1 Pipe installaitonWhen installing the pipes, the pump housing must notbe stressed by the pipes.The inlet and outlet pipes must be of an adequatesize, taking the pump inlet pressure into account.The pipes must be installed in a way that air pocketsare avoided, especially on the inlet side of the pump.

TM00

2263

Pipelines

The isolating valves must be fitted on either side ofthe pump to avoid having to drain the system if thepump needs to be cleaned or repaired. The pipesmust be adequately supported as close to the pumpas possible, both on the inlet and the outlet side. Thecounterflanges must lie true against the pump flangeswithout being stressed as stress would causedamage to the pump.

TM05

3488

Pump installation

5.4.2 Bypass

DANGERExplosion hazardDeath or serious personal injury‐ The pump is not allowed to run against

a closed valve except during startup.Operating against a closed valve at anextended period of time will cause anincrease in temperature and theformation of steam and may result indamages to or explosion of the pumphousing. The valve must be kept openduring operation.

If there is any danger of the pump running against aclosed valve, ensure a minimum liquid flow throughthe pump by connecting a bypass or drain to theoutlet pipe. The minimum flow rate must be at least10 % of the maximum flow rate. The flow rate andhead are stated on the pump nameplate.

5.5 Vibration damping5.5.1 Elimination of noise and vibrationsIn order to achieve optimum operation and minimumnoise and vibration, consider vibration damping of thepump. Generally, always consider this for pumps withmotors of 11 kW and up. Vibration damping ismandatory for motors of 90 kW and up. Smaller motorsizes, however, may also cause undesirable noiseand vibration.Noise and vibration are generated by the revolutionsof the motor and pump and by the flow in pipes andfittings. The effect on the environment is subjectiveand depends on correct installation and the state ofthe rest of the system.Elimination of noise and vibrations is best achievedby means of a concrete foundation, vibration dampersand expansion joints. See the figure below.

TM05

3488

28

English (GB)

5.5.2 Vibration dampersTo prevent the transmission of vibrations to buildings,we recommend that you isolate the pump foundationfrom building parts by means of vibration dampers.This decision must be made by the customer ordesigner or consultant of the installation.The selection of the right vibration damper requiresthe following data:• forces transmitted through the damper• motor speed, taking speed control, if any, into

consideration• required damping in % - suggested value is 70 %.The selection of vibration damper will differ frominstallation to installation. In certain cases, a wrongdamper may increase the vibration level. Vibrationdampers must therefore be sized by the supplier ofthe vibration dampers.If you install the pump on a foundation with vibrationdampers, always fit expansion joints on the pumpflanges. This is important to prevent the pump from"hanging" in the flanges.

5.6 Expansion jointsExpansion joints provide these advantages:• absorption of thermal expansion and contraction

of pipes caused by variations in liquid temperature• reduction of mechanical influences in connection

with pressure surges in the pipes• isolation of structure-borne noise in the pipes,

applying only to rubber bellows expansion joints.

Do not install expansion joints to make upfor inaccuracies in the pipes, such ascentre displacement or misalignment offlanges.

The expansion joints must be fitted at a minimumdistance of 1 to 1.5 times of the pipe diameters awayfrom the pump on the inlet and the outlet side. Thiswill prevent turbulence in the expansion joints, thusensuring optimum inlet conditions and minimumpressure loss on the outlet side. At flow velocitiesgreater than 5 m/s, we recommend that you fit largerexpansion joints matching the pipes.The figures below show examples of rubber bellowsexpansion joints with or without limiting rods.

TM02

4979

Rubber bellows expansion joint with limiting rods

TM02

4981

Rubber bellows expansion joint without limiting rods

We always recommend that you use expansion jointswith limiting rods for flanges larger than DN 100 inorder to reduce the effects of the expansion orcontraction forces on the pipes.Follow the supplier’s instructions and pass them on toadvisers or pipe installers. You must anchor the pipes in such a way that they donot stress the expansion joints and the pump.The figure below shows an example of a metalbellows expansion joint with limiting rods.

TM02

4980

Metal bellows expansion joint with limiting rods

29

Engl

ish

(GB)

Due to the risk of rupture of the rubber bellows, werecommend that you use metal bellows expansionjoints at temperatures above 100 °C combined withhigh pressure.

5.7 Stuffing box pipingPumps with stuffing box will always have acontinuous leakage during normal operation. Werecommend to connect a drainage pipe to the drainhole (A) of the bearing bracket, G1/2, to collect theleaking liquid.For pumps with stuffing box, type SNF, and externalbarrier liquid, connect the external flush pipe to thepipe (B) with an outer diameter of 8 mm beforestarting the pump.

A

BTM

0634

13

Pipe connections for stuffing box operation

5.8 Bearing bracket5.8.1 Lubricating bearing bracket with grease• For bearing bracket with grease nipples,

relubricate the bearings using a grease gun.

TM06

1826

For recommended re-lubricating intervals, seesection Grease-lubricated bearings.

• For bearing bracket with automatic greaselubricators, the lubricators are supplied separately.1. Remove the grease nipples.2. Fit the grease lubricators on top of the bearing

bracket.3. Set the grease lubricators to empty within 12

months according to the instructions suppliedwith the lubricators.

TM04

5173

30

English (GB)

5.8.2 Bearing bracket with constant-level oiler

There is no oil in bearing bracket when it isdelivered.Fit the constant-level oiler on the bearingbracket before filling oil into the bearingbracket. See instructions on the label onthe reservoir.

TM04

5174

Bearing bracket with constant-level oiler

Filling the oil1. Remove the filling plug.

2. Hinge down the constant-level oiler, and pour theoil through the filling hole until the oil reaches levelin the connection elbow.

A

TM05

3612

• A: 1-3 mm

3. Fill the reservoir of the constant-level oiler with oil,and snap it back into operating position. Now oilwill be filled into the bearing bracket. Air bubblescan be seen in the reservoir during this process.Continue until the correct oil level is reached.

TM07

7127

4. When no bubbles appear in the reservoir, refill thereservoir, and snap it back into operating position.

TM07

7128

5. Fit the filling plug.

The oil level in the bearing bracket mustalways be as shown in the figure below.Check the oil level regularly duringoperation, and add oil, if necessary. The oillevel must always be visible in the sightglass.

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B

A

C

D

F

E

TM04

4773

Code Description

A Filling plug

B Full constant-level oiler

C Correct oil level in bearing bracket withconstant-level oiler during operation

D Oil level in constant-level oiler whenbeing filled with oil

E Oil level when filling

F Drain plug

Checking the oil levelThe oil level in the bearing bracket will be correct aslong as the function of the constant-level oiler iscorrect.• To check the function of the constant-level oiler,

slowly drain oil through the drain plug until theconstant-level oiler starts to operate, that is untilair bubbles can be seen in the reservoir.

5.9 Bearing monitoring5.9.1 Vibration levelThe vibration level gives an indication of the conditionof the bearings.Bearing brackets with constant-level oiler areprepared for vibration measurement by means of theshock pulse method (SPM).

TM04

4925

Bearing bracket with SPM measuring points

Bearing brackets with automatic grease lubricators orgrease nipples are prepared for retrofitting of SPMfittings. Holes are plugged from factory.

A

TM06

3500

• A: plugged holes for SPM fittingBearing bracket for retrofitting of SPM measuringequipment

5.9.2 TemperatureBearing brackets with automatic grease lubricators,grease nipples or constant-level oiler have tappingsfor Pt100 sensors for monitoring the temperature ofthe bearings.These sensors can be factory-fitted, but can also beretrofitted. A Grundfos sensor is available.

A

TM07

7129

• A: 1/4" tapping for Pt100 sensorPt100 sensors fitted in bearing bracket

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5.10 Pressure gauge and mano-vacuumgauge

To ensure continuous monitoring of the operation, werecommend that you install a pressure gauge on theoutlet side and a mano-vacuum gauge on the inletside. The pressure gauge tappings must only beopened for test purposes. The measuring range ofthe gauges must be 20 % above the maximum pumppressure.When measuring with pressure gauge on the pumpflanges, note that a pressure gauge does not registerdynamic pressure. On all pumps, the diameters of the inlet and outletflanges are different which results in different flowvelocities at the two flanges. Consequently, thepressure gauge on the outlet flange will not show thepressure stated in the technical documentation, but avalue which may be up to 1.5 bar or approximately 15m of head lower.

5.11 AmmeterWe recommend connecting an ammeter to check themotor load.

5.12 Condensation coverWhen installing the pumps outdoors, provide themotor with a suitable cover to avoid condensation.When mounting the condensation cover on top of themotor, make sure to leave enough space for the air tocool the motor.

TM07

7675

Motors with condensation cover

6. Electrical connectionThe electrical connection must be carried out by aqualified electrician in accordance with localregulations.

DANGERElectric shockDeath or serious personal injury ‐ Before removing the terminal box

cover, and before removing ordismantling the pump, make sure thatthe power supply has been switchedoff and that it cannot be accidentallyswitched on again. Use lockout-tagoutif available. The pump must beconnected to an external main switch.

DANGERExplosive environment Death or serious personal injury ‐ Whenever powered equipment is used

in explosive surroundings, the rulesand regulations generally orspecifically imposed by the relevantauthorities or trade organisations mustbe observed.

The operating voltage and frequency are stated onthe nameplate. Make sure that the motor is suitablefor the power supply of the installation site.The electrical connection must be carried out asshown in the wiring diagram inside the terminal boxcover.

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6.1 Motor protection

DANGERElectric shockDeath or serious personal injury‐ The motor must be protected against

overload by an external motor-protective circuit breaker with IEC tripclass 10 or 20.

‐ Grundfos recommends using trip class20.

‐ The current setting of the motor-protective circuit breaker must beadjusted to the nominal current statedon the motor nameplate.

DANGERAutomatic startupDeath or serious personal injury‐ Before starting any repair work on

motors incorporating a thermal switchor thermistors, make sure that themotor cannot restart automatically aftercooling.

Three-phase motors must be connected to a motor-protective circuit breaker.All three-phase Grundfos MG and MMG motors of 3kW and up incorporate a thermistor. See theinstructions in the motor terminal box.The electrical connection must be carried out asshown in the wiring diagram on the back side of theterminal box cover.

6.2 Cable entry and screwed connection,MG motor

All motors are supplied without screwed cable entries.The table below shows the numbers and sizes ofcable entry holes of the terminal box of Grundfos MGmotors according to the standard EN 50262.

Framesize Model Number x

dimensions Description

MG 71and 80 B, C 2 x M20 x 1.5

The holes haveprecast threadsand are closedwith knock-outcable entries.

MG 90and 100 B, C, D 4 x M20

The holes areclosed withknock-out cableentries.

MG 112and 132

C, D, F,H 4 x M25

MG 160and 180 F, H

4 x M402 x M20

6.3 Synchronous motorsPumps fitted with synchronous motors must beconnected to a Grundfos CUE frequency converter.

1 4

TM04

4289

Example of installation without filter

Symbol Designation

1 CUE

4 Standard motor

One line Unscreened cable

Double line Screened cable

Synchronous motors must not beconnected directly to mains supply.

The CUE must be of T/C CUE203 followed byadditional numbers and characters. See the CUEInstallation and operating instruction to setupfrequency driver together with synchronous motor.If another frequency driver brand other than CUE isrequired or specified, contact Grundfos.

T/C: CUE203 P1M2T5E20H1BXCXXXSXXXXAXBXCXXXXDXProd. no: 12345678 S/N: 123456G234

IN: 3x380-500 V 50/60Hz 3.7AOUT: 3x0-Vin 0-100Hz 4.1 A 2.8 kVACHASSIS/IP20 Tamb. 45C/122F

IIIIIIIIIIIBAR CODEIIIIIIIIIII MADE IN DENMARK

Listed 76X1 E134261 Ind. Contr. Eq.See manual for prefuse

CAUTION:SEE MANUAL / VOIR MANUEL

WARNING:STORED CHARGE DO NOT TOUCH UNTIL4 MIN AFTER DISCONNECTION

CHARGE RESIDUELLE, ATTENDRE4 MIN APRES DECONNEXION

1.5 kW (400V)

TM07

7181

Example of CUE nameplate

Text description

T/CCUE (product name)203... (internal code)

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English (GB)

6.4 Frequency converter operationAll three-phase motors can be connected to afrequency converter.Frequency converter operation will often expose themotor insulation system to a heavier load and causethe motor to be more noisy than usual due to eddycurrents caused by voltage peaks.A large motor driven via a frequency converter will beloaded by bearing currents.Check these operating conditions if the pump isdriven via a frequency converter:

Operatingconditions Action

2-pole motors from45 kW, 4-polemotors from37 kW and 6-polemotors from 30 kW

Check that one of the motorbearings is electricallyisolated.Contact Grundfos.

Noise criticalapplications

Fit an output filter between themotor and the frequencyconverter. This reduces thevoltage peaks and thus thenoise.

Particularly noisecritical applications Fit a sinusoidal filter.

Cable length

Fit a cable that meets thespecifications laid down by thefrequency converter supplier.The length of the cablebetween motor and frequencyconverter affects the motorload.

Supply voltage upto 500 V

Check that the motor issuitable for frequencyconverter operation.

Supply voltagebetween 500 V and690 V

Fit a sinusoidal filter betweenthe motor and the frequencyconverter which reduces thevoltage peaks and thus thenoise, or check that the motorhas reinforced insulation.

Supply voltage of690 V and higher

Fit a sinusoidal filter and checkthat the motor has reinforcedinsulation.

7. Starting up the product

7.1 Checking pumps with stuffing box

Do not start the pump until it has beenfilled with liquid and vented.

CAUTIONBiological hazardMinor or moderate personal injury‐ When pumping drinking water, the

pump must be flushed thoroughly withclean water before startup in order toremove any foreign matters, such aspreservatives, test liquid or grease.

1. In the case of pumps with stuffing box, check thatthe stuffing box gland is correctly fitted. It must bepossible to turn the pump shaft manually.

2. If the pump has been inactive for a long period,turn it manually to make sure it has not got stuck.

3. Loosen the stuffing box or remove the packing.

7.2 Flushing the pipe system

CAUTIONBiological hazardMinor or moderate personal injury‐ When pumping drinking water, the

pump must be flushed thoroughly withclean water before startup in order toremove any foreign matters, such aspreservatives, test liquid, or grease.

• Before starting up the pump, thoroughly clean,flush and fill the pipe system with clean water.

The warranty does not cover anydamage caused by flushing the pipesystem by means of the pump.

The pump is not designed to pumpliquids containing solid particles suchas pipe debris and welding slag.

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7.3 Priming7.3.1 Priming the product in closed systems or

open systems where the liquid level is abovethe pump inlet

1. Close the isolating valve in the outlet pipe andslowly open the isolating valve in the inlet pipe.Both the pump and the inlet pipe must becompletely filled with liquid.

WARNINGEscaping liquidDeath or serious personal injury‐ Pay attention to the orientation of

the priming hole to ensure that theescaping liquid does not causepersonal injury or damage to themotor or other components.

‐ In hot-liquid installations, payspecial attention to the risk ofpersonal injury caused by scaldinghot liquid.

‐ In cold-liquid installations, payspecial attention to the risk ofpersonal injury caused by coldliquid.

2. Loosen the priming plug in order to vent thepump. Once liquid runs out, tighten the primingplug.

7.3.2 Priming the product in inlet operation withnon-return valve

The inlet pipe and the pump must be filled with liquidand vented before the pump is started.1. Close the isolating valve in the outlet pipe and

slowly open the isolating valve in the inlet pipe.

2. Remove the priming plug indicated by M.

3. Pour liquid through the hole until the inlet pipe andthe pump are completely filled with liquid.

4. Fit the priming plug indicated by M.

5. The inlet pipe may be filled and vented via thepriming plug. Alternatively, a priming device withfunnel can be installed before the pump.

M

E

TM03

3935

Drain plug (E), priming and venting plug (M)

7.3.3 Priming the product in open systems wherethe liquid level is below the pump inlet

1. If an isolating valve is fitted on the inlet side of thepump, the valve must be fully open.

2. Close the isolating valve in the outlet pipe, andtighten the priming and drain plugs.

M

E

TM03

3935


3. Connect a manual venting pump with the funnelinstead of a priming device.

4. Install a slide valve between the venting pumpand the centrifugal pump in order to protect theventing pump against excessive pressure.

5. Once the slide valve at the manual venting pumphas been opened, vent the inlet pipe using short,rapid pump strokes until the liquid runs out on theoutlet side.

6. Close the valve at the venting pump.

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7.4 Checking the direction of rotation

Do not start the pump to check thedirection of rotation until it has been filledwith liquid.

The correct direction of rotation is shown by arrowson the pump housing, and can visibly be checked bymeans of the motor fan. Looking at the motor fan, thedirection of rotation must be clockwise.

7.5 Starting up the pump1. Fully open the isolating valve on the inlet side of

the pump and leave the isolating valve on theoutlet side almost closed.

2. Start the pump.

3. Vent the pump during startup by loosening the airvent screw in the pump head or pump head coveruntil a steady stream of liquid runs out of the venthole.

A

TM07

7183

Position of vent screw (A)

WARNINGEscaping liquidDeath or serious personal injury‐ Pay attention to the orientation of

the vent hole to ensure that theescaping liquid does not causepersonal injury or damage to themotor or other components.

‐ In hot-liquid installations, payspecial attention to the risk ofpersonal injury caused by scaldinghot liquid.

‐ In cold-liquid installations, payspecial attention to the risk ofpersonal injury caused by coldliquid.

4. When the pipes have been filled with liquid, slowlyopen the isolating valve on the outlet side until it isfully open.

5. Check the overload by measuring the motorcurrent consumption and comparing the value tothe rated current stated on the motor nameplate.In case of overload, throttle the valve on the outletside until the motor is no longer overloaded.

If the pump is fitted with a motor withan output selected on the basis of aspecific maximum flow rate, the motormay be overloaded if the differentialpressure is lower than anticipated.

6. Always measure the motor current consumptionduring startup.

At the moment of startup, the inputcurrent of the pump motor is up to sixtimes higher than the full-load currentstated on the motor nameplate.

7.6 Shaft seal run-in periodThe seal faces are lubricated by the pumped liquid,meaning that there may be a certain amount ofleakage from the shaft seal. When the pump isstarted for the first time, or when a new shaft seal isinstalled, a certain run-in period is required before theleakage is reduced to an acceptable level. The timerequired depends on the operating conditions, that is,every time the operating conditions change, a newrun-in period is started.Under normal conditions, the leaking liquidevaporates, and as a result, no leakage will bedetected.Liquids such as kerosene do not evaporate, anddrops are visible, but it is not a shaft seal failure.

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7.6.1 Mechanical shaft sealsMechanical shaft seals are precision components. Ifthe mechanical shaft seal of a recently installed pumpfails, it normally happens within the first few hours ofoperation. The main cause of such failures isimproper installation of the shaft seals and/ormishandling of the pump during installation.

7.6.2 Stuffing boxThe stuffing box gland must not be too tight duringstartup in order to let sufficient liquid lubricate theshaft and the packing rings. Once the stuffing boxhousing and the stuffing box gland have reachedapproximately the same temperature as the pumpparts, the running-in of the stuffing box gland iscomplete. If the stuffing box leaks too much, retightenthe gland slightly and evenly while the pump isrunning. To ensure continuous lubrication, a fewdrops should always drop from the stuffing box toprotect the packing rings or shaft sleeve. Werecommend 40 to 60 drops/minute.

7.7 Number of motors starting or stopping

Frame size

Maximum number of motor startsper hour

Number of poles

2 4 6

56-71 100 250 350

80-100 60 140 160

112-132 30 60 80

160-180 15 30 50

200-225 8 15 30

250-315 4 8 12

7.8 Reference readings of monitoringequipment

We recommend taking initial readings of theseparameters:• vibration level - use SPM measuring points• bearing temperature - if sensors have been fitted• inlet and outlet pressure - use pressure gauges.The readings can be used as reference in case ofabnormal operation.

8. Storing the product1. The contractor must inspect the equipment on

delivery and make sure that it is stored in such away that corrosion and damage are avoided.

2. If you do not operate the pump soon after arrival,store it in a clean, dry place under slow, moderatechanges in ambient temperature.

3. Protect the pump from moisture, dust, dirt andforeign bodies. Before and during storage werecommend the following precautions:a. Make sure that the bearings are filled with the

recommended grease to prevent moisture fromentering around the shaft.

b. Make sure that the inlet and outlet ports and allother openings are covered with cardboard,wood or masking tape to prevent foreignobjects from entering the pump.

c. If the unit is to be stored where there is noprotective covering, cover it with a tarpaulin orwaterproof material, or other suitable covering.

d. Rotate the shaft two turns every two weeks toprevent corrosion of the bearing surfaces andthe stuffing box or shaft seal faces caused bymoisture.

4. If the pump is to be stored for more than sixmonths before being put into operation, apply asuitable corrosion inhibitor to the internal pumpparts.Make sure that the corrosion inhibitor used doesnot affect the rubber parts with which it comes intocontact.Commercially available preservatives can be usedfor this purpose. Please observe themanufacturer’s instructions for application orremoval.

5. Keep all openings covered until the pipes areready to be fitted to prevent water and dust fromentering the pump.The cost of having to dismantle the pump duringstartup to remove foreign objects can be veryhigh.

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9. Servicing the product

9.1 Contaminated products

CAUTIONBiological hazard Minor or moderate personal injury ‐ Flush the pump thoroughly with clean

water and rinse the pump parts inwater after dismantling.

The product will be classified as contaminated if it hasbeen used for a liquid which is toxic or injurious tohealth.If you request Grundfos to service the product,contact Grundfos with details about the liquid beforereturning the product for service. Otherwise, Grundfoscan refuse to accept the product for service.The product must be cleaned thoroughly before youreturn it.Costs of returning the product are to be paid by thecustomer.

9.2 Service kitsService kits for the products, see Grundfos ProductCenter in www.grundfos.com or Service KitCatalogue.

10. Maintaining the product

DANGERElectric shock and unintended pumpstartDeath or serious personal injury‐ Before starting work on the product,

switch off the power supply. Make surethat the power supply cannot beaccidentally switched on.

10.1 Maintenance of the pumpThe pump is maintenance-free.

10.1.1 Maintenance of the mechanical shaft sealsMechanical shaft seals are maintenance-free,working almost without any leakages. If anyconsiderable and increasing seepage occurs, checkthe mechanical shaft seal immediately. If the slidingsurfaces are damaged, replace the entire shaft seal.Treat mechanical shaft seals with the greatest care.

10.1.2 Stuffing boxIf the stuffing box leaks too much and cannot befurther tightened, the stuffing box must be repacked.After removal, clean and check the shaft sleeve,chamber and stuffing box gland. For furtherinformation, see the service instructions for NK.

10.1.3 Replacing the packing rings

2 13 TM06

3415

Sectional view of a stuffing box

Pos. Description

1 Stuffing box gland

2 Packing ring

3 Distribution ring

Follow these steps when replacing the packing rings:1. Loosen stuffing box gland and remove it.

2. Remove old packing ring, distribution ring, if any,and packing rings behind the distribution ring,using a packing ring hook.

3. Insert two new packing rings one at a time. Pushthem firmly into position, staggering the joints 120degrees.

4. Insert distribution ring, if any.

5. For D24/D32, insert one, and for D42/D48/D60,insert two more packing rings, staggering thejoints 120 degrees. If no distribution ring is used,two extra packing rings will be required.

6. Reinstall stuffing box gland.

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http://www.grundfos.com

Starting pumps with new packing ringsPacking rings require lubrication. Therefore, thestuffing box must always be allowed to leak 40 to 60drops per minute. Never overtighten the stuffing boxgland.For suction lift applications, it can be necessary toslightly overtighten the gland while starting the pumpto avoid air from entering the pump. Air in the pump inthis situation will result in the pump being unable todraw the liquid to the pump.1. Loosen the gland immediately when the pump

delivers liquid allowing a leakage of 40 to 60drops per minute.

2. Readjust after a few hours of operation if leakageincreases.

10.1.4 Shaft sleeve replacementThe shaft sleeve can be worn out as the sleeve lifedepends on the application. When the leakage is toohigh even with new packing rings in combination witha slight overtightening, the shaft sleeve needs to bereplaced.

10.2 Lubrication of bearings in bearingbracket10.2.1 Grease-lubricated bearings

Pump with greased-for-life bearings

TM04

4771

Bearing bracket with closed, greased-for-lifebearings

The bearing bracket with closed, greased-for-lifebearings is maintenance-free. Under optimumoperating conditions, the bearing life will beapproximately 17,500 operating hours. After thatperiod, we recommend that you replace the bearings.See section Taking the product out of operation.

To check the bearings, regularly listen tothem by means of a solid rod. There areno SPM measuring points for this type ofbearing bracket.

Pump with lubrication nipples or automaticgrease lubricators

TM06

1827

Bearing bracket with open roller bearing and doubleangular contact bearing lubricated via greasenipples

TM06

1828

Bearing bracket with open roller bearing and doubleangular contact bearing lubricated via automaticgrease lubricators

If the pump has grease nipples or automatic greaselubricators, the grease in the bearings must berenewed during the whole life time.Under optimum operating conditions, the bearing lifewill be approximately 100,000 operating hours. Afterthat period, we recommend that you replace thebearings. See section Taking the product out ofoperation. New bearings must be filled with greaseaccording to Grundfos specifications. Clean up all theused grease in the bearing bracket before replacingthe new bearing.

40

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Installing automatic grease lubricatorsReplace lubricators every 12 months. When replacingthe lubricators, follow this procedure:1. Remove the main drain plug in the bottom of the

bearing bracket for one hour during operation toremove old and excess grease.

2. Fit the new lubricators on top of the bearingbracket and set them to empty within 12 monthsaccording to the instruction supplied with thelubricators.

A BB TM06

1829

• A: Main drain plug• B: Grease drain plugs

3. Refit the main drain plug in the bottom of thebearing bracket.Grundfos recommends SKF SYSTEM 24lubricators, type LAGD 125/HP2 or LAGD 60/HP2.

Quantity Product number

2 x LAGD 125/HP2 96887371

2 x LAGD 60/HP2 97776374

Relubrication via grease nipplesGrundfos recommends the following relubricatingintervals and grease quantities:

Diameterof shaft

[mm]

Relubricatinginterval

[operatinghours]

Grease quantity [g]

Rollerbearing

Angularcontactbearing

24 7500 11 15

32 4500 13 20

42 4500 22 30

48 3500 27 38

60 3500 30 41

The relubricating interval is an estimatedvalue, valid for an operating temperatureup to 70 °C. We recommend to halve theintervals for every 15 °C increase inoperating temperature above 70 °C.

Renewing the grease

If there is visible grease leakage, werecommend that you open the bearingbracket cover and replace the V ring. Seesection Taking the product out ofoperation.

If the pump has been stored or is out ofoperation for more than six months, werecommend you to replace the greasebefore the pump is put into operation.

In case of ingress of contamination, morefrequent relubrication than indicated by therelubricating interval will reduce thenegative effects of foreign particles. Thiswill reduce the damaging effects causedby overrolling the particles. Liquidcontaminants, such as water or processliquids, also call for shorter relubricatingintervals. In case of severe contamination,consider continuous relubrication.

Never mix greases with differentthickeners, such as a lithium-based greasewith a sodium-based grease, beforechecking with the suppliers.Never mix a mineral oil with a synthetic oil.Some lubricants are compatible, butassessing the compatibility of twolubricants can be difficult. As a generalrule, always relubricate a bearing with thesame lubricant as was used originally.

Follow this procedure to renew grease:1. Place a suitable container under the bearing

bracket to collect used grease.

2. Remove the grease drain plugs.

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3. Fill the bearing bracket with the recommendedquantity of grease by means of a grease gun.

A BB TM06

1829

• A: Main drain plug• B: Grease drain plugsRenewing the grease

Grundfos recommends SKF LGHP2 grease forrelubrication. See the table below.

Basic characteristics

Code, DIN 51825 K2N-40

Consistency class,NLGI 2-3

Thickener Polyurea (di-urea)

Base oil Mineral

Operating temperature-40 to +150 °C,-40 to +302 °F

Dropping point, ISO2176 240 °C, 464 °F

Density, DIN 5175 At 20 °C, 68 °F: 0.85 -0.95 g/cm3

Base oil viscosity

40 °C, 104 °F 96 mm2/s

100 °C, 212 °F 10.5 mm2/s

4. Refit the drain plugs.

10.2.2 Lubricating the bearings with oil

TM04

4329

Bearing bracket with oil-lubricated roller and doubleangular contact bearings

Under optimum operating conditions, the life of theroller and double angular contact bearings will beapproximately 100,000 operating hours. After thatperiod, we recommend that you replace the bearings.See section Taking the product out of operation.

To monitor the bearing condition, regularlymeasure vibration levels using the SPMmeasuring points on the bearing bracket.See section Vibration level.

• Lubricate the bearings with mineral oil.Intervals for oil change as well as the requiredquantities are specified below.

Bearingtemperature

Initial oilchange

Subsequent oilchanges

Up to 70 °CAfter 400

hours

Every 4400hours

70-90 °C Every 2200hours

Bearing type

Diameter ofcoupling

shaft[mm]

Approximateoil quantity

[ml]

Roller andangular contact

bearings

42 850

48 1700

60 1350

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English (GB)

10.2.3 Changing the oil1. Place a suitable container under the bearing

bracket to collect used oil.

2. Remove the filling plug and the drain plug.

3. After drainage of the bearing bracket, fit the drainplug, and fill the bearing bracket with new oil. Seesection Bearing bracket with constant-level oiler.

Check the oil level regularly duringoperation, and add oil, if necessary.The level must always be visible in thesight glass.

Basic characteristicsShell Omala 68

Testmethod

Viscosity grade ISO 68

AGMA EP Gear OilGrade 68

Old AGMA Grade 2 EP

Viscosity

At 40 °C, 104 °F D 445 68mm2/s

At 100 °C, 212 °F D 445 8.8mm2/s

Flash point, COC, °F D 92 405

Pour point, °F D 97 -15

10.3 Monitoring equipmentWe recommend that you take weekly readings ofthese parameters:• vibration level - use SPM measuring points• bearing temperature - if sensors have been fitted• inlet and outlet pressure - use pressure gauges.Alternatively, follow the maintenance plan laid out foryour application.

10.4 Maintaining the motor

It is important to keep the motor clean in order toensure adequate ventilation.• Check the motor at regular intervals.• If the pump is installed in a dusty environment,

check and clean it regularly.

10.5 Lubrication of motor bearings10.5.1 MG motorsThe bearings of motors up to 11 kW are greased forlife and require no lubrication.The bearings of motors of 11 kW and up must begreased in accordance with the indications on themotor nameplate.

10.5.2 Siemens motorsMotors up to and including frame size 250 havemaintenance-free, greased-for-life bearings.Motors of frame sizes larger than 250 must begreased according to the indications on the motornameplate. Grease spills from the motor may occur.

10.5.3 Other motorsFor other motor makes with grease nipples, lubricatethe motor according to the indications on the motornameplate. Grease specifications: See sectionBearing grease.

10.5.4 Bearing greaseThe lithium-based grease used should meets thefollowing specifications:• NLGI class 2 or 3• viscosity of basic oil: 70 to 150 cSt at +40 °C• temperature range: -30 °C to +140 °C during

continuous operation.

10.6 Applying sealant to plugsRemember to clean the threads and apply sealant tothe plug when assembling it.

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11. Taking the product out of operation

11.1 Protecting the pump during periods ofinactivity and frost

Pumps that are not being used during periods of frostmust be drained to avoid damage.

WARNINGEscaping liquidDeath or serious personal injury‐ Ensure that the escaping liquid does

not cause personal injury or damage tothe motor or other components.

‐ In hot-liquid installations, pay specialattention to the risk of personal injurycaused by scalding hot liquid.

‐ In cold-liquid installations, pay specialattention to the risk of personal injurycaused by cold liquid.

1. Drain the pump by removing the drain plug.

M

E

TM03

3935


2. Do not tighten the priming plug or replace thedrain plug until the pump is to be used again.

3. If the pump is to be drained before a long periodof inactivity, inject a few drops of silicone oil on theshaft at the bearing bracket. This will prevent theshaft seal faces from seizing up.

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12. Fault finding the product

DANGERElectric shockDeath or serious personal injury‐ Before removing the terminal box

cover and before removing ordismantling the pump, make sure thatthe power supply has been switchedoff and that it cannot be accidentallyswitched on again.

WARNINGEscaping liquidDeath or serious personal injury‐ Pay attention to the orientation of the

vent hole to ensure that the escapingliquid does not cause personal injury ordamage to the motor or othercomponents. In hot-liquid installations,pay special attention to the risk ofpersonal injury caused by scalding hotliquid. In cold-liquid installations, payspecial attention to the risk of personalinjury caused by cold liquid.

CAUTIONHot or cold surfaceMinor or moderate personal injury‐ When pumping hot or cold liquids,

make sure that persons cannotaccidentally come into contact with hotor cold surfaces.

Fault Cause Remedy

1. The pump deliversno or too little liquid.

a) The electrical connection is wrong, forinstance two phases.

Check the electrical connection andremedy, if necessary.

b) The direction of rotation is wrong. Interchange two phases of the powersupply.

c) There is air in the inlet pipe. Vent and fill the inlet pipe and pump.

d) The counterpressure is too high.Set the duty point in accordance with thedata sheet. Check the system forimpurities.

e) The inlet pressure is too low.

Increase the liquid level on the inlet side.Open the isolating valve in the inlet pipe.Make sure that all the conditions in Stuffingbox piping are complied with.

f) The inlet pipe or impeller is blocked byimpurities. Clean the inlet pipe or pump.

g) The pump draws in air due to a defectiveseal.

Check the pipeline seals, pump housinggaskets and shaft seals. Replace gasketsand seals, if necessary.

h) The pump draws in air due to low liquidlevel.

Increase the liquid level on the inlet sideand keep it as constant as possible.

45

Engl

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(GB)

Fault Cause Remedy

2. The motor-protective circuitbreaker has trippedbecause the motor isoverloaded.

a) The pump is blocked by impurities. Clean the pump.

b) The pump is running above rated dutypoint.

Set the duty point in accordance with thedata sheet.

c) The density or viscosity of the liquid ishigher than specified when ordering.

If less flow is sufficient, reduce the flow onthe outlet side. Otherwise, fit a morepowerful motor.

d) The motor-protective circuit breakeroverload setting is incorrect.

Check the setting of the motor-protectivecircuit breaker and replace, if necessary.

e) The motor runs on two phases. Check the electrical connection. Replacethe fuse, if defective.

3. The pump makestoo much noise. Thepump runs unevenlyand vibrates.

a) The inlet pressure is too low, that is thepump cavitates.


b) There is air in the inlet pipe or pump. Vent and fill the inlet pipe or pump.

c) The counterpressure is lower thanspecified.

Set the duty point in accordance with thedata sheet.

d) The pump draws in air due to low liquidlevel.

Increase the liquid level on the inlet sideand keep it as constant as possible.

e) The impeller is out of balance or theimpeller blades are clogged. Clean and check the impeller.

f) The inner parts are worn. Replace the defective parts.

g) The pump is stressed by the pipes thuscausing starting noise.

Mount the pump so that it is not stressed.Support the pipes.

h) The bearings are defective. Replace the bearings.

i) The motor fan is defective. Replace the fan.

j) The coupling is defective.Replace the coupling. Align the coupling.See related information for Alignment ofpump and motor.

k) There are foreign bodies in the pump. Clean the pump.

l) Frequency converter operation. See related information for Frequencyconverter operation.

4) The pump,connections, shaftseal or stuffing boxare leaking.

a) The pump is stressed by the pipes thuscausing leaks in the pump housing orconnections.

Mount the pump so that it is not stressed.Support the pipes.

b) Pump housing gaskets and gaskets atconnections are defective.

Replace the pump housing gaskets orgaskets at connections.

c) The mechanical shaft seal is dirty orstuck together. Check and clean the mechanical shaft seal.

d) The mechanical shaft seal is defective. Replace the mechanical shaft seal.

e) The stuffing box is defective. Retighten the stuffing box. Repair orreplace the stuffing box.

f) The shaft surface or shaft sleeve isdefective.

Replace the shaft or the shaft sleeve.Replace the packing rings in the stuffingbox.

46

English (GB)

Fault Cause Remedy

5) The temperaturein the pump or motoris too high.

a) There is air in the inlet pipe or pump. Vent the inlet pipe or the pump andreplenish.

b) The inlet pressure is too low.


c) The bearings are lubricated with toolittle, too much or unsuitable lubricant. Replenish, reduce or replace the lubricant.

d) The pump with bearing seatis stressedby the pipes.

Mount the pump so that it is not stressed.Support the pipes. Check the alignment ofthe coupling.See related information for Alignment ofpump and motor.

e) The axial pressure is too high. Check the relief holes of the impeller andthe lock rings on the inlet side.

f) The motor-protective circuit breaker isdefective or the setting is incorrect.

Check the setting of the motor-protectivecircuit breaker and replace, if necessary.

g) The motor is overloaded. Reduce the flow rate.

6) Oil is leaking fromthe bearing bracket.

a) The bearing bracket has been filled withtoo much oil through the filling hole,resulting in an oil level above the bottom ofthe shaft.

Drain off oil until the constant-level oilerstarts to operate, that is when air bubblescan be seen in the reservoir.

b) The oil seals are defective. Replace the oil seals.

7) Oil is leaking fromthe reservoir. The threads on the reservoir are damaged. Replace the reservoir.

47

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(GB)

13. Technical data

13.1 Operating conditions13.1.1 Ambient temperature and altitude

Do not exceed the allowable maximumambient temperature stated on the motornameplate. If nothing is stated, then themaximum allowed ambient temperature is40 °C.

The ambient temperature and the installation altitudeare important factors for the motor life as they affectthe life of the bearings and the insulation system.If the ambient temperature exceeds therecommended maximum ambient temperature or theinstallation altitude exceeds the recommendedmaximum altitude above sea level, seeing the figurebelow, the motor must not be fully loaded due to thelow density and consequently low cooling effect of theair. In such cases, it may be necessary to use a motorwith a higher output.

20 25 30 35 40 45 50 55 60 65 70 75 80

5060708090

100

[%]P2

1

2

3

t [ °C]

1000 2250 3500 4750 m TM04

4914

The maximum motor output depends on theambient temperature and altitude

Pos. Description

1 0.25 - 0.55 kW MG motors

2

0.75 - 22 kW MG motors, IE2/IE3

0.75 - 450 kW MMG-H motors, IE2

0.25 - 200 kW MMG-H motors, IE3

3

0.75 - 462 kW Siemens motors, IE2



Example: A pump with a 1.1 kW IE2 MG motor: Ifthis pump is installed 4750 m above sea level, themotor must not be loaded more than 88 % of therated output. At an ambient temperature of 75 °C, themotor must not be loaded more than 78 % of therated output. If the pump is installed 4750 m above

sea level at an ambient temperature of 75 °C, themotor must not be loaded more than 88 % x 78 % =68.6 % of the rated output.

13.1.2 Liquid temperatureLiquid temperature: -40 to +140 °CThe maximum liquid temperature is stated on thepump nameplate. It depends on the shaft sealchosen.For EN-GJL-250 cast-iron pump housings, localregulations may not allow liquid temperatures above120 °C.

13.1.3 Maximum operating pressure

Do not exceed the maximum operatingpressure stated on the pump nameplate.

1

2

3

TM07

5513

Pressures in the pump

Pos. Description

1 Maximum operating pressure, that ispressure above atmospheric pressure

2 Pump pressure

3 Inlet pressure

The total value of the inlet pressure and the pumppressure must be lower than the maximum operatingpressure stated on the pump nameplate. Operationagainst a closed valve gives the highest operatingpressure.

48

English (GB)

13.1.4 Minimum inlet pressurePay attention to the minimum inlet pressure to avoidcavitation. The risk of cavitation is higher in thefollowing situations:• The liquid temperature is high.• The flow rate is considerably higher than the

pump's nominal flow rate.• The pump is operating in an open system with

suction lift.• The liquid is sucked through long pipes.• The inlet conditions are poor.• The operating pressure is low.

13.1.5 Maximum inlet pressureThe total value of the inlet pressure and the pumppressure must be lower than the maximum operatingpressure stated on the pump nameplate. Operationagainst a closed valve yields the highest operatingpressure.

13.1.6 Minimum flow rateThe pump must not run against a closed valve as itcauses an increase in temperature and a formation ofsteam in the pump. That may result in shaft damage,impeller erosion, short life of bearings and damage tothe stuffing boxes or mechanical shaft seals due tostress or vibration. The continuous stable flow ratemust be at least 10 % of the rated flow rate. The ratedflow rate is stated on the pump nameplate.

13.1.7 Maximum flow rateDo not exceed the maximum flow rate, otherwisethere is a risk of cavitation or overload, for instance.The minimum and maximum flow rates are indicatedeither on the performance curve pages in the relevantdata booklets, or on a curve for a specific pump whenselecting it in the Grundfos Product Center. Seewww.grundfos.com.

NBG 50-32-160/163, 50HzPumped liquid = WaterLiquid temperarure = 20 CDensity = 1000 kg/m3

o

H

38

(m)

32

28

24

20

16

12

8

4

00 5 10 15 20 15 30 Q(m /h)3

A

B

TM05

2444

Example from Grundfos Product Center inwww.grundfos.com showing minimum andmaximum flow rate

Pos. Description

A Minimum flow rate

B Maximum flow rate

13.1.8 Shaft sealsThe operating range of the seals is described for two main applications: Pumping of water or pumping ofcoolants.Seals with a temperature range of 0 °C and up are mainly used for pumping water, while seals for temperaturesbelow 0 °C are mainly intended for coolants.

We do not recommend that you operate the pump at maximum temperature and maximum pressureat the same time as the seal life will be reduced and periodic noise will occur.

49

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(GB)

Shaft seal diameter [mm] 28, 38 48 55 60

Shaft seal type Sealfaces Rubber Code Temperature

range Max. pressure [bar]

Bellows seal,type B,unbalanced

AQ1 EPDM BAQE 0-120 °C 16 16 16 16

AQ1 FKM BAQV 0-90 °C 16 16 16 16

BQ1 EPDM BBQE 0-120 °C 16 16 16 16

BQ1 FKM BBQV 0-90 °C 16 16 16 16

Q7Q7 EPDM BQQE -25 to +120 °C 16 16 16 16

Q7Q7 FKM BQQV -10 to +90 °C 16 16 16 16

O-ring seal, typeA, unbalanced

Q1A EPDM AQAE 0-120 °C 16 16 16 16

Q1A FKM AQAV 0-90 °C 16 16 16 16

Q1Q1 EPDM AQQE -25 to +90 °C 16 16 16 16

Q1Q1 FKM AQQV -10 to +90 °C 16 16 16 16

Q1Q1 HNBR AQQX -15 to +90 °C 16 16 16 16

Q1Q1 FFKM AQQK 0-90 °C 16 16 16 16

O-ring seal, typeD, balanced

AQ1 FXM DAQF 0-140 °C 25 25 25 25

Q6Q6 EPDM DQQE -20 to +120 °C 25 25 25 25

Q6Q6 FKM DQQV -10 to +90 °C 25 25 25 25

Q6Q6 HNBR DQQX -15 to +120 °C 25 25 25 25

Q6Q6 FFKM DQQK 0-120 °C 25 25 25 25

13.1.9 Stuffing box

Stuffing box type Code Temperature range Max. pressure [bar]

Stuffing box without cooling, with internal barrierliquid SNE -30 - +120 °C 16

Stuffing box without cooling, without barrierliquid SNO -30 - +120 °C 16

Stuffing box without cooling, with external barrierliquid SNF -30 - +120 °C 16

13.2 Electrical dataSee the motor nameplate.

50

English (GB)

13.3 Sound pressure levelThe data in this table applies for pumps includingmotor, such as MG, MMG and Siemens motors.The values stated are maximum sound pressurelevels. Tolerances are according to ISO 4871.

50 Hz motor

2-pole: n = 2900 min-1

4-pole: n = 1450 min-1

6-pole: n = 970 min-1

Motor [kW]

Maximum sound pressure level[dB(A)] - ISO 3743

Three-phase motors

2-pole 4-pole 6-pole

0.25 56 41 -

0.37 56 45 -

0.55 57 42 40

0.75 56 42 43

1.1 59 50 43

1.5 58 50 47

2.2 60 52 52

3 59 52 63

4 63 54 63

5.5 63 57 63

7.5 60 58 66

11 60 60 66

15 60 60 66

18.5 60 63 66

22 66 63 66

30 71 65 59

37 71 66 60

45 71 66 58

55 71 67 58

75 73 70 61

90 73 70 61

110 76 70 61

132 76 70 61

160 76 70 65

200 76 70 -

Motor [kW]


Three-phase motors


250 82 73 -

315 82 73 -

355 77 75 -

400 - 75 -

60 Hz motor

2-pole: n = 3500 min-1

4-pole: n = 1750 min-1

6-pole: n = 1170 min-1

Motor [kW]


Three-phase motors


0.25 - - -

0.37 - - -

0.55 - - -

0.75 - - -

1.1 64 51 -

1.5 64 52 62

2.2 65 55 60

3 54 57 67

4 68 56 67

5.5 68 62 67

7.5 73 62 70

11 70 66 70

15 70 66 57

18.5 70 63 57

22 70 63 59

30 71 65 59

37 71 65 61

45 75 65 64

55 75 68 64

75 77 71 63

90 77 71 63

110 81 75 62

51

Engl

ish

(GB)

Motor [kW]


Three-phase motors


132 81 75 62

160 81 75 66

200 81 75 70

280 86 - 72

288 - 77 75

353 86 - -

362 - 77 -

398 81 - -

408 - 79 -

460 - 79 -

13.4 Belt driveIf the unit is belt-driven, the following data must notbe exceeded:

Speed n[min-1]

Max. motor power [kW] for shaft end

∅24 ∅32 ∅42 ∅48 ∅60

1000 4 7 11 18 22

1500 5 10 25 32 38

2000 6 14 25 - -

2500 7 17.5 - - -

3000 10 20 - - -

For higher power outputs, mount an intermediateshaft with pedestal bearings.

13.5 Operation with combustion engine

When operating with petrol or dieselengines, the engine manufacturer’sinstallation and operating instructions mustbe strictly observed. Particularly thedirection of rotation is very important.

• Viewed from the drive shaft end, the pump rotatesto the right, clockwise.

• Viewed from the drive shaft end, the motor musttherefore rotate to the left, counterclockwise.

• The correct direction of rotation is indicated by thearrow on the pump housing.

• If the engine is installed in a closed area, thecombustion air data as well as data for exhaustgases must be particularly noted.

• When draining the tank, make sure to havecontainers of adequate size ready for thispurpose.

14. Disposing of the productThis product or parts of it must be disposed of in anenvironmentally sound way.1. Use the public or private waste collection service.

2. If this is not possible, contact the nearestGrundfos company or service workshop.

The crossed-out wheelie bin symbolon a product means that it must bedisposed of separately from householdwaste. When a product marked withthis symbol reaches its end of life, takeit to a collection point designated bythe local waste disposal authorities.The separate collection and recyclingof such products will help protect theenvironment and human health.

See also end-of-life information atwww.grundfos.com/product-recycling.

52

English (GB)

http://www.grundfos.com/product-recycling

ArgentinaBombas GRUNDFOS de Argentina S.A.Ruta Panamericana km. 37.500industin1619 - Garín Pcia. de B.A.Tel.: +54-3327 414 444Fax: +54-3327 45 3190

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ChinaGRUNDFOS Pumps (Shanghai) Co. Ltd.10F The Hub, No. 33 Suhong RoadMinhang DistrictShanghai 201106 PRCTel.: +86 21 612 252 22 Fax: +86 21 612 253 33

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JapanGRUNDFOS Pumps K.K.1-2-3, Shin-Miyakoda, Kita-kuHamamatsu431-2103 JapanTel.: +81 53 428 4760Fax: +81 53 428 5005

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Grundfos com

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LatviaSIA GRUNDFOS Pumps LatviaDeglava biznesa centrsAugusta Deglava ielā 60LV-1035, Rīga,Tel.: + 371 714 9640, 7 149 641Fax: + 371 914 9646

LithuaniaGRUNDFOS Pumps UABSmolensko g. 6LT-03201 VilniusTel.: + 370 52 395 430Fax: + 370 52 395 431

MalaysiaGRUNDFOS Pumps Sdn. Bhd.7 Jalan Peguam U1/25Glenmarie industrial Park40150 Shah Alam, SelangorTel.: +60-3-5569 2922Fax: +60-3-5569 2866

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New ZealandGRUNDFOS Pumps NZ Ltd.17 Beatrice Tinsley CrescentNorth Harbour Industrial EstateAlbany, AucklandTel.: +64-9-415 3240Fax: +64-9-415 3250

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PolandGRUNDFOS Pompy Sp. z o.o.ul. Klonowa 23Baranowo k. PoznaniaPL-62-081 PrzeźmierowoTel.: (+48-61) 650 13 00Fax: (+48-61) 650 13 50

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TurkeyGRUNDFOS POMPA San. ve Tic. Ltd.Sti.Gebze Organize Sanayi Bölgesi Ihsan dede Caddesi2. yol 200. Sokak No. 20441490 Gebze/ Kocaeli Tel.: +90 - 262-679 7979Fax: +90 - 262-679 7905E-mail: [email protected]

UkraineБізнес Центр ЄвропаСтоличне шосе, 103м. Київ, 03131, УкраїнаTel.: (+38 044) 237 04 00Fax: (+38 044) 237 04 01E-mail: [email protected]

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United KingdomGRUNDFOS Pumps Ltd.Grovebury RoadLeighton Buzzard/Beds. LU7 4TLTel.: +44-1525-850000 Fax: +44-1525-850011

U.S.A.GRUNDFOS Water Utility Headquarters856 Koomey RoadBrookshire, Texas 77423 USA

UzbekistanGrundfos Tashkent, UzbekistanThe Representative Office of GrundfosKazakhstan in Uzbekistan38a, Oybek street, TashkentTel.: (+998) 71 150 3290 / 71 150 3291Fax: (+998) 71 150 3292

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NK, NKG - Grundfos

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